I am going in to get an engine software update (240E). I have already done this swap with no issues on my April 08 build car. Should I swap in the old CCC controller before the update? Or is engine software update irrelevant?

thanks.

CIC controller install with cause an issue with the update. Your best bet is to swap it back before going in for the update. This is not from my personal experience but many have stated the incorrect controller part number causes an issue so take that for what it's worth